It's model specific on newer units. Some require holding buttons on the unit while pushing certain buttons on the original remote. Some require holding two or three front panel buttons down while in a certain mode then turning the voluve control (HTIB versions).
Some of the new models are outsourced from other vendors and have no service menu at all, the unit auto aligns at each disk entry.
We kind of need to know which model you have. The info on the back or bottom , not the front panel.
I believe the procedure for the service menu (with the remote) for these is "Top Menu" followed by "clear" then "power" (from standby - off). Older models were title - clear - power. It probably won't help you however, because the newer models don't have drive adjustments anymore. The factory doesn't actually even bother to fix these anymore, they exchange them with refurbished models or newer (even cheaper) models. Sorry.